City-state located to the west of Vassagonia and to the south of Sommerlund and the Wildlands. This city is independent of all surrounding kingdoms and is mainly a trading centre. It is usually first in line when Vassagonia starts getting expansionist.

Part of the Lone Wolf world, it appears substantially only in one of the Legends of Lone Wolf novels, where Lone Wolf briefly passes through the city and notices extremes of wealth and poverty (which is not, incidentally, an accurate depiction of the type of medieval city-state on which Casiorn is modelled).